Can We Re-Design the Gradient Coil to Make the Eddy Current Field Match the Primary Gradient Field?

Hector Sanchez¹, Michael Poole¹, Adnan Trakic¹, Stuart Crozier¹

MRI requires rapidly switched magnetic field gradients. This time-dependent magnetic fields induce eddy currents in nearby conducting structures. These currents generate detrimental transient magnetic fields in the region of interest (ROI) and hence, current compensation is required to minimize the consequential image distortion. In order to apply successfully current compensation techniques, it is required that the primary and the secondary magnetic fields possess a similar spatial form in the ROI. In this work we present two approaches for gradient coil design that produces gradient fields with characteristics similar to those produced by the eddy currents.